Skew Arches: Advantages and Disadvantages of Different Methods of ConstructionD. Van Nostrand, 1875 - 104 ページ |
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a₁ abscissa angle arch axis b₁ Brevet Bridges C₁ cj c's cj s's cloth common logarithm construction cos² cosec coursing joint cow's horn surface curve cut curves Q direction of pressure draw drawn edition element ellipses elliptical directrices engravings equation equation 9 h j c's h₁ helicoidal method helix hence horizontal plane horizontal projections hyperbolic paraboloid Hypsometry intersection locus maximum normal obliquity P₁ perpendicular piercing the soffit plane parallel plates point of piercing points of division Practical Prof r₁ revised and enlarged right line sin² SKEW ARCHES span springing plane Steam Engine stone Substituting tangent line Telegraphy templet tendency to slide tion Treatise U. S. Navy vertical plane vertical projections voussoirs warped surface whence wood cuts x₁ y₁ πρ